*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.big {
    position: relative;
    width: 1000px;
    height: 579px;
    margin: 100px auto;
}
#mybird {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color:black;
    margin: 0 auto;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    z-index: 3;
}
#mybird h2 {
    color: aliceblue;
    font-size: 100px;
    font-weight: bold;
    text-align: center;
}
.container div {
    color: #fff;
    text-align: center;
    font-size: 24px;
    margin-top: 40px;
}
.container button {
    width: 200px;
    height: 40px;
    background-color: #fff;
    border-radius: 20px;
    margin-top: 100px;
    margin-left: 400px;
    font-size: 32px;
    line-height: 40px;
    text-align: center;
}